Name the alloy metal that is specifically used to manufacture EACH of the following products and give a reason why the metal is used: 2.1.1 Wine tanks 2.1.2 Fitting for hot-water copper pipes 2.1.3 Hammers that can be used in an explosive atmosphere 2.2 Give ONE example of where the following materials are used on a farm - NSC Agricultural Technology - Question 2 - 2022 - Paper 1

Brass is commonly used for fittings in hot-water copper pipes due to its strength, machinability, and corrosion resistance, which ensures longevity in wet conditions.

Bronze is the alloy metal of choice for hammers used in explosive environments, primarily because it does not generate sparks and maintains low friction, enhancing safety.

One example of high-tensile steel on a farm is its use in tow bars for tractors, where strength and flexibility are essential.

An example of cast iron usage on a farm is in the engine block of tractors, providing necessary durability for heavy machinery.

The annealing process of copper involves heating the metal to a temperature range of 500 – 550 °C and then allowing it to cool down gradually, either in air or sand. This process helps to relieve internal stresses and improve ductility.

When selecting an adhesive for repairing the fibreglass water trough, the primary considerations should be the type of material to be joined and the conditions under which this joint will be used.

Before applying the adhesive, the surface area around the crack must be cleaned thoroughly. This involves sanding the area lightly to remove dirt, ensuring a clean surface for optimal adhesion.

Methods to join fibreglass parts include using pop rivets and bolts/nuts.

Two methods to add color to a fibreglass trough are painting and dyeing.

Bakelite will become extremely hot and may discolor when exposed to extreme heat but is generally durable without significant effect.

Perspex can easily change shape when heated as it is not very heat resistant; it may even burn or melt if subjected to sufficiently high temperatures.

Silicon will melt and deform under extreme heat conditions, compromising its structural integrity.

Vesconite is known for its low static and dynamic friction. It exhibits no friction in environments that are dry or wet, making it an excellent choice for applications subjected to various loads.

Warning signs should:

1. Measure at least 100 mm x 200 mm.
2. Have inscriptions in black stating 'BE AWARE - ELECTRIC FENCE.'
3. Be visible on both sides with a minimum height of 25 mm, and include at least two languages.

An electrical fence could be used:

1. To protect temporary areas.
2. To keep dangerous animals, such as lions, away from farm boundaries.

Two alternative energy sources for powering an electrical fence include wind energy and solar energy.

The three components needed to create a fire are:

1. Material that can burn,
2. Oxygen,
3. A heat source (such as matches or a lighter).

Two reasons for using resin casting as an insulating material when joining three-phase electrical wires are:

1. It is waterproof,
2. It provides toughness and prevents corrosion/rust.